329655706465
domain: N
Appears in sequences
- Expansion of (1+x)/cos(x).at n=17A009002
- Expansion of log(1 + tanh(x))/cos(x).at n=17A009391
- Expansion of e.g.f.: log(1+tanh(x))/cosh(x).at n=17A009392
- Expansion of e.g.f. x/cos(x) (odd powers only).at n=8A009843
- Expansion of e.g.f. x * (tan(x) + sec(x)).at n=16A065619
- Triangle, read by rows, equal to the matrix inverse of triangle A103327, where A103327(n,k) = binomial(2*n+1,2*k+1).at n=36A104033
- Expansion of e.g.f.: (1+x)*sech(x).at n=17A119882
- Numerator of 2*n*A000111(n-1)/A000111(n): approximations of Pi, using Euler (up/down) numbers.at n=16A132049
- a(n) = Numerator((-1)^n*Euler(2*n)*(2*n+1)/(4^(2*n+1)-2^(2*n+1))), where Euler(n) = A122045(n).at n=8A160143
- Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.at n=17A193472